I am attaching my design and result of Gains.S11 parameter is less than -10dB from 3.1 to 9.8 Ghz.Z11 magnitude also lies between 40 -60 ohm for this range .Still gain is negative. Pls help
Dr Sapna--
A negative directive gain in a certain direction means radiated power is less than the average value. If the gain is negative in all directions, then the antenna is not working (radiating properly). This can happen at certain frequencies, or when the antenna is not properly matched.For more on this have a look at :
https://www.researchgate.net/post/I-have-got-a-negative-gain-in-gain-vs-frequency-graph-of-microstrip-antenna-design-What-does-it-mean
-please take a look at the following useful link:
https://www.researchgate.net/post/Getting_negative_gain_in_designing_a_rectangular_patch_antenna_in_HFSS_How_to_get_positive_gain_in_HFSS
Regards--
Ijaz Durrani sir
since antenna impedence lies between 40-60 ohms ,so impedence matching is there between patch and feed line.
kindly check my files
Sapna Arora
Dear Sapna,
Negative gain (In dB) is possible for antennas. The value depends upon the directivity of the antenna. From the graph it is observed that the Phi and Theta values are '0's. Try varying Theta and Phi values. If you want positive gains at those values only means then the structure needs to be modified.
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